Doctrine hydrator overwrites one related entity by another - php

Question

I need to get array of orders, with first and last OrderItem in it.
Table order_item:
id
order_id
status
1
1
0
2
1
1
3
1
0
4
1
1
5
1
0
Order entity
<?php
namespace App\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use JMS\Serializer\Annotation as Serializer;
/**
* Order
*
* #ORM\Entity
* #ORM\Table(name="orders")
*/
class Order
{
/**
* #var int
* #ORM\Column(name="id", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
* #Serializer\Groups(groups="order_list")
*/
private $id;
/**
* #var string
* #ORM\Column(name="title", type="string", nullable=false)
* #Serializer\Groups(groups={"order_list"})
*/
private $title;
/**
* #var Collection
* #ORM\OneToOne(targetEntity="OrderItem", mappedBy="orderFirst")
* #Serializer\Groups(groups={"order_list"})
*/
private $orderItemFirst;
/**
* #var Collection
* #ORM\OneToOne(targetEntity="OrderItem", mappedBy="orderLast")
* #Serializer\Groups(groups={"order_list"})
*/
private $orderItemLast;
/**
* #var Collection|OrderItem[]
* #ORM\OneToMany(targetEntity="OrderItem", mappedBy="order")
* #Serializer\Groups(groups={"order_list"})
*/
private $items;
public function __construct()
{
$this->items = new ArrayCollection();
}
// getters and setters ...
}
OrderItem entity
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
use JMS\Serializer\Annotation as Serializer;
/**
* Order
*
* #ORM\Entity
* #ORM\Table(name="order_item")
*/
class OrderItem
{
/**
* #var int
* #ORM\Column(name="id", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
* #Serializer\Groups(groups="order_list")
*/
private $id;
/**
* #var Order|null
* #ORM\OneToOne(targetEntity="Order", inversedBy="orderItemFirst")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="order_id", referencedColumnName="id")
* })
*/
private $orderFirst;
/**
* #var Order|null
* #ORM\OneToOne(targetEntity="Order", inversedBy="orderItemLast")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="order_id", referencedColumnName="id")
* })
*/
private $orderLast;
/**
* #var Order|null
* #ORM\ManyToOne(targetEntity="Order", inversedBy="items")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="order_id", referencedColumnName="id")
* })
*/
private $order;
/**
* #var bool
* #ORM\Column(type="boolean", nullable=false)
* #Serializer\Groups(groups="order_list")
*/
private $status;
// getters and setters...
}
Code in service
$repository = $em->getRepository(\App\Entity\Order::class);
$qb = $repository->createQueryBuilder('t');
$qb
->leftJoin('t.orderItemFirst', 'oi', \Doctrine\ORM\Query\Expr\Join::WITH, 'oi.status = :status')
->leftJoin('t.orderItemFirst', 'oi2', \Doctrine\ORM\Query\Expr\Join::WITH, 'oi2.status = :status AND oi2.id > oi.id')
->leftJoin('t.orderItemLast', 'oi3', \Doctrine\ORM\Query\Expr\Join::WITH, 'oi3.status = :status')
->leftJoin('t.orderItemLast', 'oi4', \Doctrine\ORM\Query\Expr\Join::WITH, 'oi4.status = :status AND oi4.id < oi3.id')
->setParameter('status', true)
->addSelect('oi')
->addSelect('oi3')
->where('oi2.id IS NULL')
->andWhere('oi4.id IS NULL')
->groupBy('t.id')
;
$query = $qb->getQuery();
$query->setHint(\Doctrine\ORM\Query::HINT_REFRESH, true);
/*
* This returns
* "orderItemFirst": {"id": 4}
* "orderItemLast": {"id": 4}
*/
$result = $query->getResult();
But getArrayResult() returns correct data:
"orderItemFirst": {
"id": 2,
"status": true
},
"orderItemLast": {
"id": 4,
"status": true
}
And even if I call getArrayResult() at first, getResult() starts to hydrate correctly. What a strange behavior? Can it be done without double executing query?